Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 106-2320-B-006-036, MOST-105-2321-B-006 -024)
National Health Research Institutes (NHRI-106A1-MRCO-0517171)
Ministry of Health and Welfare (MOHW104-CDC-C-114-114901-H105002)
Received: 13 July 2019
Accepted: 23 September 2019
First Online: 23 October 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of National Cheng Kung University Hospital, Tainan, Taiwan. (IRB approval no. A-ER-104-386 and B-ER-104-178). The study objectives and procedures were explained to the participants before obtaining written consent.
: Not applicable.
: All authors declare that they have no competing interests. However, Guey Chuen Perng is a member of editorial board of BMC Infectious Diseases.